Band-saw for cutting iron or steel.



PATENTED JAN.17, 1905.

A. E. MUIRHEAD. BAND SAW FOR GUTTING IRON 0R STEEL.

APPLICATION FILED FEB. 11,1902.

25 side view of the same.

Miran S'rarns Patented January 15?, 1905.

arena Urrrcn.

BAND-SAW FOP CU'l'TlNG IRON OH STEEL.

SPECIFICATION forming part of Letters Patent No. 780,215, dated January 1'7, 1905. Application filed February 11, 1902. Serial No. 93,529.

To (Z7 whom zit may concern.-

Be it known that 1, ANDREW ERsKINn MUIR- HEAD, forgeman, of Cart Forge, in the city of Glasgow, Scotland, have invented certain new and useful Improvements in Band-Saws for Cuttinglron or Steel, of which the following is a specification.

Hitherto band-saws consisted'in placing the ribbon constituting the saw to run upon a narrow pulley in such a manner that the cut could only be obtained in a plane lateral to the machine.

The object of my invention is to mount two or more saw-ribbons on one pair of pulleys i5 and take up the slack when necessary by the the saw at right angles to face of pulley and facing operation.

.In the drawings, Figure 1 is a front elevation of a niultiple-band-saw machine made in accordance with my invention. Fig. 2 is a Fig. 3 is a front view of the upper guide roller 01' pulley. Fig. 4 is a side view of the same.

A is the upper pair of pulleys, mounted one on each side of a central standard A, and B is the lower and driving pulleys,which receive the motion after the manner of the band-saw machines now in use and are mounted one on either side of the central standard A, like the pulleys A. Such an arrangement of the two ;5 pulleys allows for the easy removal of the saw-ribbons when it is desired to remove the same. Each pair of pulleys, which may be of any suitable diameter and breadth, is mounted with four saw-ribbons U, D, E, and F,

0 though a greater or less number may be used.

A corresponding number of upper guide-rollers, two only of which are shown and Which are marked G and H, are mounted and adjustable upon a bar beneath the said upper i5 pulley A and at any convenient distance above the table K of the machine. Immediately above the lower pulley B and beneath the table of the machine to which they are fixed at its lower edge are the lower guide-rollers L, corresponding to the number of the upper ones and the number of the said ribbons. These guide-rollers consist of grooved pulleys rotatably supported within a bracket or depending arm Ur, which is adjustably supported in a slotted bar P, secured to the bracket P, forming a part of the framework of the machine. The bracket P is also capable of being raised and lowered. Each of the sawribbons is moved against a weighted antifriction roller or pulley Q, which gives a con tinuous tension to and takes up the slack of the ribbon. The column of the machine has an upper and lower pulley at either side thereof, as shown. in lieu of this multiple arrangement an upper and lower pulley of a convenient length may be employed to carry a considerable number of saw-ribbons. The saw-ribbons in lieu of being placed with the inner bearing-surface in one plane round both pulleys may have a twist, so that the inner surface of the saw-ribbon would lie round the periphery of the lower pulley and the outer surface upon the periphery of the upper pulley, or vice versa.

1. In a band-saw machine, the combination with a suitable frame, pulleys carried by said frame, saw-ribbons carried by said pulleys, an adjustable bracket also carried by said frame, a slotted bar carried by said bracket, adjustable depending arms carried by said bar and grooved guide -rollers carried by said arms and engaging the saw-ribbons.

2. In a band-saw machine, the combination with a suitable frame, having a central standard, of upper and lower band-pulleys mounted on each side of said standard and saw-ribbonsparried by said pulleys.

In testimony whereofI afiix my signature in presence of two witnesses.

ANDREW ERSKINE MUIRHEAD.

Witnesses:

JOHN LIDDLn, AeNns MneKINrosH. 

